Bay Port, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.1 °F (low) to 55.4 °F (high). Annual precipitation averages 30.3 Inches. Bay Port is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.4 °F | 29.4 °F | 1.66 in. |
| February | 16.3 °F | 31.2 °F | 1.49 in. |
| March | 24.3 °F | 40.2 °F | 1.56 in. |
| April | 34.7 °F | 52.9 °F | 3.15 in. |
| May | 46.1 °F | 66.2 °F | 3.13 in. |
| June | 56.3 °F | 75.6 °F | 3.34 in. |
| July | 61.4 °F | 80.0 °F | 3.01 in. |
| August | 60.2 °F | 78.0 °F | 3.24 in. |
| September | 53.6 °F | 71.4 °F | 2.87 in. |
| October | 42.9 °F | 58.9 °F | 2.83 in. |
| November | 32.8 °F | 46.0 °F | 2.23 in. |
| December | 24.0 °F | 35.0 °F | 1.76 in. |
| Annual | 39.1 °F | 55.4 °F | 30.27 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |